Weather is one of the most important factors affecting drone operations and a frequent topic on the FAA knowledge test. Pilots must understand how weather conditions influence aircraft performance, visibility, and flight safety. Common exam topics include atmospheric stability, temperature, pressure, humidity, wind, and the formation of clouds, fog, and thunderstorms. Even small weather changes can significantly impact a drone's ability to fly safely and maintain control.
Part 107 pilots should be familiar with aviation weather reports and forecasts, particularly METARs and TAFs. A METAR provides current observed weather conditions at an airport, while a TAF provides a forecast of expected conditions. The FAA exam often tests a pilot's ability to decode weather reports, interpret wind information, determine visibility and cloud ceilings, and identify hazardous conditions such as thunderstorms, wind shear, icing, and low visibility. Understanding weather charts and weather-related abbreviations is also an important skill.
Before every flight, pilots should review current and forecast weather conditions and assess whether the operation can be conducted safely. Strong winds, precipitation, low visibility, and convective activity can quickly turn a routine mission into a hazardous situation. Developing good weather decision-making habits not only helps you pass the FAA exam but also contributes to safer and more professional drone operations.
Reading METAR Weather Reports
METARs (Meteorological Aerodrome Reports) are standardized weather observations issued by airports, typically every hour. While they may look intimidating at first, they follow a consistent format. For the Part 107 exam, you should be able to identify the most common weather elements, including wind, visibility, cloud ceilings, precipitation, temperature, altimeter setting, and remarks.
Cloud layers are abbreviated using FEW, SCT, BKN, and OVC, representing increasing cloud coverage. The three digits that follow indicate the cloud base in hundreds of feet AGL (Above Ground Level). For example, BKN025 means a broken cloud layer at 2,500 feet AGL, while OVC008 indicates an overcast ceiling at 800 feet AGL. Visibility is reported in statute miles (SM), such as 10SM or 2SM, and common weather abbreviations include RA (rain), FG (fog), BR (mist), HZ (haze), and TS (thunderstorm).
Common METAR Abbreviations
| Code | Meaning |
|---|
| METAR | Routine hourly weather observation |
| SPECI | Special weather report |
| AUTO | Automated observation |
| KT | Knots |
| SM | Statute miles |
| FEW | Few clouds (1–2/8 coverage) |
| SCT | Scattered clouds (3–4/8) |
| BKN | Broken clouds (5–7/8) |
| OVC | Overcast (8/8 coverage) |
| RA | Rain |
| DZ | Drizzle |
| SN | Snow |
| FG | Fog |
| BR | Mist |
| HZ | Haze |
| TS | Thunderstorm |
| A2992 | Altimeter setting of 29.92 inHg |
| RMK | Remarks section |
Understanding the Remarks (RMK) Section
The RMK (Remarks) section contains additional weather details that do not fit into the standard METAR format. Although most Part 107 questions focus on the main body of the METAR, you should recognize that remarks may provide useful information such as peak wind speeds, variable visibility, lightning, recent weather, exact temperatures and dew points, pressure tendencies, or maintenance indicators.
For the exam, you generally do not need to memorize every remarks code. Instead, know that everything after "RMK" is supplemental information. If a question references the remarks section, read it carefully for any additional details that could affect flight safety.